1
A charge Q is situated at the corner of a cube, the electric flux passed through all the six faces of the cube is
- Q6 0
- Q8 0
- Q 0
- Q2 0
Answer
(2) Q8 0
Solution
Imagine 8 identical cubes placed around the corner so that the charge Q is at the centre of a big cube formed by them.
By Gauss's law, total flux through the big cube = Q 0
By symmetry each small cube receives an equal share:
= 18 Q 0 = Q8 0
(This flux passes out through the three faces not touching the charge; the three faces meeting at the corner have zero flux.)
Answer: (2)
AIPMT 2000